| Country | Action | Action Date | Effective Date |
|---|
| Anguilla | Extension | 23/05/1957 | 04/05/1959 |
| ANTIGUA AND BARBUDA | Adherence | | 21/07/1982 |
| Antilles | Extension | 16/02/1982 | |
| ARGENTINA | Adherence | 18/05/1960 | 18/05/1960 |
| ARGENTINA | Statement | 18/05/1960 | |
| Aruba | Extension | 16/02/1982 | 01/01/1986 |
| AUSTRALIA | Signature | 19/11/1956 | |
| AUSTRALIA | Ratification | 08/04/1957 | 04/05/1959 |
| AUSTRIA | Adherence | | 20/05/1994 |
| BELIZE | Adherence | | 15/07/1982 |
| BELIZE | Withdrawal | 30/12/1987 | 30/06/1988 |
| BRAZIL | Signature | 19/11/1956 | |
| BRAZIL | Ratification | 04/05/1959 | 04/05/1959 |
| BRAZIL | Withdrawal | 27/12/1965 | 30/06/1966 |
| BRAZIL | Adherence | 04/01/1974 | |
| British Antarctic Territory | Extension | 23/05/1957 | 04/05/1959 |
| British Virgin Islands | Extension | 23/05/1957 | 04/05/1959 |
| CANADA | Signature | 19/11/1956 | |
| CANADA | Ratification | 14/06/1957 | 04/05/1959 |
| CANADA | Withdrawal | 24/06/1981 | 30/06/1982 |
| Cayman Islands | Extension | 23/05/1957 | 04/05/1959 |
| CHILE | Adherence | 05/02/1992 | 05/02/1992 |
| CHINA | Adherence | | 24/09/1980 |
| COSTA RICA | Adherence | | 06/05/1981 |
| COSTA RICA | Adherence | | 24/07/1981 |
| COSTA RICA | Withdrawal | 01/06/1981 | |
| DENMARK | Signature | 19/11/1956 | |
| DENMARK | Ratification | 26/07/1957 | 04/05/1959 |
| DOMINICA, COMMONWEALTH OF | Adherence | | 09/07/1981 |
| DOMINICA, COMMONWEALTH OF | Adherence | | 18/07/1992 |
| DOMINICA, COMMONWEALTH OF | Withdrawal | 15/06/1982 | 30/06/1983 |
| ECUADOR | Adherence | | 02/05/1991 |
| ECUADOR | Withdrawal | 08/12/1993 | 30/06/1994 |
| EGYPT | Adherence | | 18/09/1981 |
| Falkland Islands | Extension | 23/05/1957 | 04/05/1959 |
| FINLAND | Adherence | 23/02/1983 | 23/02/1983 |
| FRANCE | Signature | 19/11/1956 | |
| FRANCE | Ratification | 14/04/1958 | 04/05/1959 |
| GERMANY FEDERAL REPUBLIC | Declaration | | 02/07/1982 |
| GERMANY FEDERAL REPUBLIC | Adherence | 02/07/1982 | 02/07/1982 |
| Gibraltar | Extension | 23/05/1957 | 04/05/1959 |
| GRENADA | Adherence | | 07/04/1993 |
| ICELAND | Signature | 19/11/1956 | |
| ICELAND | Ratification | 23/11/1956 | 04/05/1959 |
| ICELAND | Withdrawal | 27/12/1991 | 30/06/1992 |
| ICELAND | Adherence | 11/06/2001 | |
| ICELAND | Reservation | 11/06/2001 | |
| ICELAND | Reservation | 10/10/2002 | |
| INDIA | Adherence | | 09/03/1981 |
| IRELAND, REPUBLIC OF | Adherence | | 02/01/1985 |
| ITALY | Ratification | 02/12/1998 | 02/12/1998 |
| JAMAICA | Adherence | 15/07/1981 | |
| JAMAICA | Withdrawal | 02/09/1983 | 30/06/1984 |
| JAPAN | Signature | 19/11/1956 | |
| JAPAN | Ratification | 24/05/1957 | 04/05/1959 |
| KENYA | Adherence | | 02/12/1981 |
| KOREA REPUBLIC OF | Adherence | 29/12/1979 | 29/12/1978 |
| Land Berlin | Extension | 02/07/1982 | 02/07/1982 |
| MAURITIUS | Adherence | | 17/06/1983 |
| MAURITIUS | Withdrawal | 27/08/1987 | 30/06/1988 |
| MEXICO | Signature | 19/11/1956 | |
| MEXICO | Ratification | 09/03/1959 | 04/05/1959 |
| MONACO | Adherence | 15/03/1982 | 15/03/1982 |
| Montserrat | Extension | 23/05/1957 | 04/05/1959 |
| NETHERLANDS THE | Signature | 19/11/1956 | |
| NETHERLANDS THE | Ratification | 23/12/1957 | 04/05/1959 |
| NETHERLANDS THE | Withdrawal | 31/12/1958 | 30/06/1959 |
| NETHERLANDS THE | Adherence | 04/05/1962 | |
| NETHERLANDS THE | Withdrawal | 24/12/1969 | 30/06/1970 |
| NETHERLANDS THE | Adherence | 14/06/1977 | 14/06/1977 |
| NETHERLANDS THE | Declaration | 16/02/1982 | |
| NEW ZEALAND | Signature | 19/11/1956 | |
| NEW ZEALAND | Ratification | 21/06/1957 | 04/05/1959 |
| NEW ZEALAND | Withdrawal | 01/10/1968 | 30/06/1969 |
| NEW ZEALAND | Adherence | 15/06/1976 | 15/06/1976 |
| NORWAY | Signature | 19/11/1956 | |
| NORWAY | Ratification | 15/04/1957 | 04/05/1959 |
| NORWAY | Withdrawal | 29/12/1958 | 30/06/1959 |
| NORWAY | Adherence | 23/09/1960 | |
| NORWAY | Notification | 23/09/1960 | |
| OMAN | Adherence | | 15/07/1980 |
| PANAMA | Signature | 19/11/1956 | |
| PANAMA | Ratification | 09/02/1959 | 04/05/1959 |
| PANAMA | Withdrawal | 07/02/1979 | 30/06/1980 |
| PERU | Adherence | 27/12/1979 | 27/12/1979 |
| PHILIPPINES | Adherence | | 10/08/1981 |
| PHILIPPINES | Withdrawal | 03/12/1987 | 30/06/1988 |
| Pitcairn,Henderson,Ducie & Oeno Islands | Extension | 23/05/1957 | 04/05/1959 |
| SAINT LUCIA | Adherence | | 29/06/1981 |
| SENEGAL | Adherence | | 15/07/1982 |
| SEYCHELLES | Adherence | 19/03/1979 | 19/03/1979 |
| SEYCHELLES | Withdrawal | 18/04/1994 | 30/06/1995 |
| SOLOMON ISLANDS | Adherence | | 18/07/1985 |
| SOUTH AFRICA | Signature | 19/11/1956 | |
| SOUTH AFRICA | Ratification | 25/04/1957 | 04/05/1959 |
| South Georgia And South Sandwich Islands | Extension | 23/05/1957 | 04/05/1959 |
| SOVIET UNION | Signature | 19/11/1956 | |
| SOVIET UNION | Ratification | 03/07/1957 | 04/05/1959 |
| SOVIET UNION | Notification | 25/06/1992 | |
| SPAIN | Adherence | | 06/07/1979 |
| St Helena, Ascension & Tristan | Extension | 23/05/1957 | 04/05/1959 |
| ST KITTS AND NEVIS | Adherence | | 24/06/1992 |
| ST VINCENT AND THE GRENADINES | Adherence | | 22/07/1981 |
| SWEDEN | Signature | 19/11/1956 | |
| SWEDEN | Ratification | 06/06/1957 | 04/05/1959 |
| SWEDEN | Withdrawal | 17/12/1963 | 30/06/1964 |
| SWEDEN | Adherence | 15/06/1979 | |
| SWITZERLAND | Adherence | | 29/05/1980 |
| Turks And Caicos Islands | Extension | 23/05/1957 | 04/05/1959 |
| UNITED KINGDOM | Signature | 19/11/1956 | |
| UNITED KINGDOM | Ratification | 23/05/1957 | 04/05/1959 |
| UNITED KINGDOM | Objection | 17/07/2001 | |
| UNITED STATES OF AMERICA | Signature | 19/11/1956 | |
| UNITED STATES OF AMERICA | Ratification | 30/08/1957 | 04/05/1959 |
| URUGUAY | Adherence | | 15/07/1981 |
| URUGUAY | Withdrawal | 15/10/1990 | 30/06/1991 |
| VENEZUELA | Adherence | | 11/07/1991 |